* {
  box-sizing: border-box;
}
body {
  margin: 0px;
}
.text-red {
  color: cornflowerblue;
}
.bgRed {
  background-color: darkblue !important;
}
.bg-blue {
  background-color: blue;
}
.nav-bar {
  width: 100%;
  height: 100px;
  border-bottom: #000000 1px dotted;
  box-shadow: 2px 2px 3px #000000;
  position: fixed;
  background-color: #ffffff;
}

.nav {
  display: flex;
  justify-content: space-between;
  width: 1100px;
  background-color: #123456;
  flex-wrap: wrap;
  margin: 0 auto;
}
.logo {
  width: 400px;
}
.logo:hover {
  background-color: black;
}
.logo img {
  width: 400px;
}
.nav-items {
  width: 700px;
}
.nav-items {
  padding-top: 16px;
  box-sizing: border-box;
}
.nav-items ul {
  display: flex;
  list-style: none;
  justify-content: space-around;
}
.nav-items a {
  color: #777777;
  text-decoration: none;
}
.nav-items .active {
  color: #777777;
}
.nav-items a:hover {
  color: #777777;
  text-decoration: underline;
}
.banner {
  width: 100%;
  height: 400px;
  background-image: url(img/第三次课堂用.jpg);
  background-size: 100%;

  background-position-y: -100px;
  background-repeat: no-repeat;
  text-align: center;
  padding-top: 170px;
}
.bannerTxt {
  width: 90%;
  height: 60px;
  margin: 0px auto;
  font-size: 40px;
  background-color: rgba(255, 255, 255, 0.7);
  border-radius: 6px;
  box-shadow: 2px 2px 4px #000000;
}
.mainContainer {
  width: 1100px;
  height: 1000px;
  margin: 0px auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}
.newsArea {
  width: 62%;
  height: 700px;
}
.newsAreaTitle ,.playAreaTitle{
  width: 100%;
  height: 100px;
  display: flex;
  justify-content: space-between;
  padding-top: 50px;
  border-bottom: #999999 1px solid;
  margin-bottom: 20px;
}
.newsAreaTitle .txt ,.playAreaTitle.txt{
  font-size: 30px;
  font-weight: bold;
  border-bottom: #057ab1 4px solid;
}
.newsAreaTitle .link{
    line-height: 46px;
    padding-top: 15px;
}
.newsListArea {
  width: 100%;
  height: 500px;
}
.playArea {
  width: 31%;
  height: 700px;
  
}
.playAreaContent{padding: 20px;font-size: 18px;}
.playAreaContent div{margin-bottom:10px;}
.playAreaContent div:last-child(display: flex: justify-content: space-between;margin-top:15px;)
.playAreaContent div:nth-child(6){display: flex;}
.linkArea,
.contactArea {
  width: 45%;
  height: 250px;

}
.newsArea.，.playArea,
.linkArea,.contactArea {
  background-color: rgb(240, 240, 240);
  border: rgb(200, 200) 1px solid;
  

}
.linkArea{
  padding: 20px;
}
.linkArea i{font-size: 400px;
}
input{
  width: 100%;height: 40px;
  border: #aaa 1px solid;
  border-radius: 5px;
  font-size: 15px;
  padding: 0 10px;
  outline: none;
}
input[name="tbCode"]{width:50%;}
input:focus{
  border: #057ab1 1px solid;
   box-shadow:0 0 5px #32afe9;
}
button{
  width:33%;height:40px;
  border:none;border-radius:5px;
  background-color: #1ba8e9;
  color:#ffffff;font-size: 18px;
  cursor:pointer;
}
button:hover{background-color:#0578ad;}
button:first-child{background-color: #f5a512;color:#000000}
button:first-child:hover{background-color: #f5a512;}